SIST EN ISO 17234-2:2011

SLOVENSKI STANDARD
SIST EN ISO 17234-2:2011
01-november-2011
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GHO'RORþHYDQMHDPLQRD]REHQ]HQD,62
Leather - Chemical tests for the determination of certain azo colorants in dyed leathers -
Part 2: Determination of 4-aminoazobenzene (ISO 17234-2:2011)
Leder - Chemische Prüfungen zur Bestimmung bestimmter Azofarbstoffe in gefärbten
Ledern - Teil 2: Bestimmung von 4-Aminoazobenzol (ISO 17234-2:2011)
Cuir - Essais chimiques pour le dosage de certains colorants azoïques dans les cuirs
teints - Partie 2: Dosage du 4-aminoazobenzène (ISO 17234-2:2011)
Ta slovenski standard je istoveten z: EN ISO 17234-2:2011
ICS:
59.140.30 Usnje in krzno Leather and furs
SIST EN ISO 17234-2:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 17234-2:2011

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SIST EN ISO 17234-2:2011


EUROPEAN STANDARD
EN ISO 17234-2

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2011
ICS 59.140.30
English Version
Leather - Chemical tests for the determination of certain azo
colorants in dyed leathers - Part 2: Determination of 4-
aminoazobenzene (ISO 17234-2:2011)
Cuir - Essais chimiques pour le dosage de certains Leder - Chemische Prüfungen zur Bestimmung bestimmter
colorants azoïques dans les cuirs teints - Partie 2: Dosage Azofarbstoffe in gefärbten Ledern - Teil 2: Bestimmung von
du 4-aminoazobenzène (ISO 17234-2:2011) 4-Aminoazobenzol (ISO 17234-2:2011)
This European Standard was approved by CEN on 10 March 2011.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17234-2:2011: E
worldwide for CEN national Members.

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SIST EN ISO 17234-2:2011
EN ISO 17234-2:2011 (E)
Contents Page
Foreword .3

2

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SIST EN ISO 17234-2:2011
EN ISO 17234-2:2011 (E)
Foreword
This document (EN ISO 17234-2:2011:2011) has been prepared by Technical Committee CEN/TC 289
“Leather”, the secretariat of which is held by UNI, in collaboration with the International Union of Leather
Technologists and Chemists Societies.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by September 2011, and conflicting national standards shall be
withdrawn at the latest by September 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
3

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SIST EN ISO 17234-2:2011

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SIST EN ISO 17234-2:2011

INTERNATIONAL ISO
STANDARD 17234-2
IULTCS/IUC
20-2
First edition
2011-03-15

Leather — Chemical tests for the
determination of certain azo colorants in
dyed leathers —
Part 2:
Determination of 4-aminoazobenzene
Cuir — Essais chimiques pour le dosage de certains colorants azoïques
dans les cuirs teints —
Partie 2: Dosage du 4-aminoazobenzène




Reference number
ISO 17234-2:2011(E)
IULTCS/IUC 20-2:2011(E)
©
ISO 2011

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SIST EN ISO 17234-2:2011
ISO 17234-2:2011(E)
IULTCS/IUC 20-2:2011(E)
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ii © ISO 2011 – All rights reserved

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SIST EN ISO 17234-2:2011
ISO 17234-2:2011(E)
IULTCS/IUC 20-2:2011(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 General .1
4 Principle .2
5 Safety precautions .2
6 Apparatus.2
7 Reagents .3
8 Sampling .3
9 Procedure.4
9.1 Degreasing .4
9.2 Reductive cleavage .4
9.3 Separation and concentration of 4-aminoazobenzene.4
9.4 Calibration solution.4
9.5 Check of the analytical system .5
9.6 Chromatographic analyses .5
10 Evaluation .5
10.1 Calculation with internal standard.5
10.2 Calculation without internal standard.5
10.3 Reliability of the method.6
11 Test report.6
Annex A (informative) Chromatographic analyses .7
Annex B (informative) Reliability of the method.14
Annex C (informative) Assessment guide — Interpretation of analytical results .15
Bibliography.16

© ISO 2011 – All rights reserved iii

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SIST EN ISO 17234-2:2011
ISO 17234-2:2011(E)
IULTCS/IUC 20-2:2011(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 17234-2 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 289, Leather, in collaboration with the Chemical Test Commission of the International Union of
Leather Technologists and Chemists Societies (IUC Commission, IULTCS), in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement). This method is technically
similar to the method in IUC 20-2.
IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further the
advancement of leather science and technology. IULTCS has three Commissions, which are responsible for
establishing international methods for the sampling and testing of leather. ISO recognizes IULTCS as an
international standardizing body for the preparation of test methods for leather.
ISO 17234 consists of the following parts, under the general title Leather — Chemical tests for the
determination of certain azo colorants in dyed leathers:
⎯ Part 1: Determination of certain aromatic amines derived from azo colorants
⎯ Part 2: Determination of 4-aminoazobenzene

iv © ISO 2011 – All rights reserved

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SIST EN ISO 17234-2:2011
ISO 17234-2:2011(E)
INTERNATIONAL STANDARD
IULTCS/IUC 20-2:2011(E)

Leather — Chemical tests for the determination of certain azo
colorants in dyed leathers —
Part 2:
Determination of 4-aminoazobenzene
1 Scope
This part of ISO 17234 is supplementary to ISO 17234-1 and describes a special procedure to detect the use
of certain azo colorants in commodities, which can release 4-aminoazobenzene. The procedure also detects
4-aminoazobenzene (Solvent Yellow 1) which is already available as free amine in commodities without
reducing pretreatment.
Azo colorants that are able to form 4-aminoazobenzene generate, under the conditions of ISO 17234-1, the
amines aniline and 1,4-phenylenediamine. The presence of these 4-aminoazobenzene colorants cannot be
reliably ascertained without additional information (e.g. the chemical structure of the colorant used) or without
a special procedure.
The use of certain azo colorants, which may release, by reductive cleavage of their azo group(s), one or more
of the other aromatic amines listed in Annex XVII of Regulation (EC) No. 1907/2006 of the European
Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals
(REACH), except 4-aminoazobenzene, cannot be determined quantitatively with this method.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location
ISO 4044, Leather — Chemical tests — Preparation of chemical test samples
3 General
Certain azo colorants may release by reductive cleavage of their azo group(s), 4-aminoazobenzene, which is
proscribed under Annex XVII of Regulation (EC) No. 1907/2006 of the European Parliament and of the
Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH).
Table 1 — 4-aminoazobenzene proscribed under Regulation REACH 1907/2006/Annex XVII
No. CAS number Index number EC number Substance
22 60-09-3 611-008-00-4 200-453-6 4-aminoazobenzene
© ISO 2011 – All rights reserved 1

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SIST EN ISO 17234-2:2011
ISO 17234-2:2011(E)
IULTCS/IUC 20-2:2011(E)
4 Principle
After degreasing, the leather sample is treated with sodium dithionite in an alkaline solution at 40 °C in a
closed vessel. 4-Aminoazobenzene, which is released in the process, is transferred to a tert-butyl methyl ether
phase by means of liquid/liquid extraction. An aliquot of the tert-butyl methyl ether phase is used for analysis.
The detection and determination of 4-aminoazobenzene is performed using high-performance liquid
chromatography (HPLC) with a diode array detector (DAD) or mass selective detector (HPLC/MS), capillary
gas chromatography with a mass-selective detector (GC/MS) or capillary electrophoresis with a diode array
detector (CE/DAD), or qualitatively with thin-layer chromatography (TLC, HPTLC).
If 4-aminoazobenzene is detected by one chromatographic method, confirmation shall be made using one or
more alternative methods. Amine quantification is performed by HPLC/DAD.
5 Safety precautions
5.1 The compound 4-aminoazobenzene is classified as a substance suspected to be a human carcinogen.
Any handling and disposal of this substance shall be in strict accordance with the appropriate national health
and safety regulations.
5.2 It is the user's responsibility to use safe and proper techniques when handling materials in this test
method. Consult manufacturers for specific details, such as material safety data sheets and other
recommendations.
5.3 Good laboratory practice should be followed. Wear safety glasses in all laboratory areas, and a dust
respirator and single-use gloves while handling powder colorants and 4-aminoazobenzene.
5.4 Users should comply with any national and local safety regulations.
6 Apparatus
Usual laboratory equipment and, in particular, the following.
6.1 Suitable reaction vessel, of temperature-resistant glass with a gastight closure.
6.2 Heating source, that generates a temperature of (40 ± 2) °C.
6.3 Separator, with a revolution speed of more than 3 000 r/min.
6.4 Vacuum rotary evaporator.
6.5 Pipettes, in required or variable sizes.
6.6 Ultrasonic bath, at least 160 W, with controllable heating.
−1
6.7 Horizontal shaker, with a sufficient frequency of 5 s , path length 2 cm to 5 cm.
6.8 Polypropylene or polyethylene syringe, 2 ml.
6.9 Instrumental equipment
6.9.1 Gas chromatography (GC), with mass-selective detector (MS).
6.9.2 High-performance liquid chromatography (HPLC), with gradient elution and diode array
detector (DAD) or mass-selective detector (MS).
2 © ISO 2011 – All rights reserved

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SIST EN ISO 17234-2:2011
ISO 17234-2:2011(E)
IULTCS/IUC 20-2:2011(E)
6.9.3 Thin-layer chromatography (TLC), or high-performance thin-layer chromatography (HPTLC)
equipment, including relevant detection.
...